Designing Hexagonal Architecture: With Java Pdf Repack

public interface ProductRepository Optional<Product> findById(String id); void save(Product product);

record CreateProductCommand(String name, double price, String currency) {} } designing hexagonal architecture with java pdf

@RequiredArgsConstructor public class CreateProductService implements CreateProductUseCase private final ProductRepository productRepository; // depends on outgoing port public interface ProductRepository Optional&lt

// domain/model/Money.java public record Money(double amount, String currency) void save(Product product)

@SpringBootTest @Testcontainers class JpaProductRepositoryTest @Container static PostgreSQLContainer<?> postgres = new PostgreSQLContainer<>("postgres:15"); @Test void shouldSaveAndRetrieve() // ... real database test